1 Biology of Agrosystems, Misión Biológica de Galicia, Consejo Superior de Investigaciones Científicas (CSIC) Pontevedra, Spain.
2 Institute of Agricultural Biology and Biotechnology, Consiglio Nazionale delle Ricerche Milan, Italy.
3 Institute of Agricultural Sciences (ICA), Consejo Superior de Investigaciones Científicas (CSIC) Madrid, Spain.
4 Directorate General in Charge of Research and Strategy, French Agricultural Research and International Cooperation Organization (CIRAD)Montpellier, France; Research Unit Management of Renewable Resources and the Environment (UPR GREEN) (CIRAD)Montpellier, France.